Predictive control method of voltage-type PWM (pulse-width modulation) rectifier fixed-frequency model
A technology of model predictive control and rectifier, which is applied to the control of voltage-type PWM rectifier and the field of fixed-frequency model predictive control of voltage-type PWM rectifier. Controller burden and other issues, to achieve the effect of not being easy to design for electromagnetic interference, eliminating high sampling frequency, reducing current ripple and current distortion
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[0014] The present invention will be further described below in conjunction with the accompanying drawings. figure 1 middle, u ga , u gb , u gc is a three-phase voltage source on the AC side, i ga , i gb , i gc is the three-phase AC side current, u ca , u cb , u cc is the three-phase voltage at the input side of the power bridge, u dc is the DC side voltage, L g with R g are the incoming inductance and its equivalent resistance, respectively, C is the DC filter capacitor, O is the midpoint of the grid, i L is the load current, the DC side load is determined by the resistor R L equivalent representation. Define a unipolar binary logic switch function S k , when S k =1( k = a, b, c) for the converter k The upper bridge arm of the phase is opened, and the lower bridge arm is closed; S k =0 means the upper bridge arm is closed and the lower bridge arm is open.
[0015] Under stable conditions, the mathematical model of the PWM rectifier in t...
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